public async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (bindingContext.ModelMetadata.IsComplexType)
{
// this type cannot be converted
return(null);
}
var valueProviderResult = await bindingContext.ValueProvider.GetValueAsync(bindingContext.ModelName);
if (valueProviderResult == null)
{
return(null); // no entry
}
object newModel;
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
try
{
newModel = valueProviderResult.ConvertTo(bindingContext.ModelType);
ModelBindingHelper.ReplaceEmptyStringWithNull(bindingContext.ModelMetadata, ref newModel);
var validationNode = new ModelValidationNode(
bindingContext.ModelName,
bindingContext.ModelMetadata,
newModel);
var isModelSet = true;
// When converting newModel a null value may indicate a failed conversion for an otherwise required
// model (can't set a ValueType to null). This detects if a null model value is acceptable given the
// current bindingContext. If not, an error is logged.
if (newModel == null && !AllowsNullValue(bindingContext.ModelType))
{
bindingContext.ModelState.TryAddModelError(
bindingContext.ModelName,
Resources.FormatCommon_ValueNotValidForProperty(newModel));
isModelSet = false;
}
return(new ModelBindingResult(newModel, bindingContext.ModelName, isModelSet, validationNode));
}
catch (Exception ex)
{
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, ex);
}
// Were able to find a converter for the type but conversion failed.
// Tell the model binding system to skip other model binders i.e. return non-null.
return(new ModelBindingResult(model: null, key: bindingContext.ModelName, isModelSet: false));
}
internal async Task <IEnumerable <TElement> > BindComplexCollectionFromIndexes(ModelBindingContext bindingContext,
IEnumerable <string> indexNames)
{
bool indexNamesIsFinite;
if (indexNames != null)
{
indexNamesIsFinite = true;
}
else
{
indexNamesIsFinite = false;
indexNames = Enumerable.Range(0, Int32.MaxValue)
.Select(i => i.ToString(CultureInfo.InvariantCulture));
}
var metadataProvider = bindingContext.OperationBindingContext.MetadataProvider;
var elementMetadata = metadataProvider.GetMetadataForType(typeof(TElement));
var boundCollection = new List <TElement>();
foreach (var indexName in indexNames)
{
var fullChildName = ModelBindingHelper.CreateIndexModelName(bindingContext.ModelName, indexName);
var childBindingContext = ModelBindingContext.GetChildModelBindingContext(
bindingContext,
fullChildName,
elementMetadata);
var didBind = false;
object boundValue = null;
var modelType = bindingContext.ModelType;
var result = await bindingContext.OperationBindingContext.ModelBinder.BindModelAsync(childBindingContext);
if (result != null)
{
didBind = true;
boundValue = result.Model;
}
// infinite size collection stops on first bind failure
if (!didBind && !indexNamesIsFinite)
{
break;
}
boundCollection.Add(ModelBindingHelper.CastOrDefault <TElement>(boundValue));
}
return(boundCollection);
}
internal void ProcessDto(ModelBindingContext bindingContext, ComplexModelDto dto)
{
var validationInfo = GetPropertyValidationInfo(bindingContext);
// Eliminate provided properties from requiredProperties; leaving just *missing* required properties.
validationInfo.RequiredProperties.ExceptWith(dto.Results.Select(r => r.Key.PropertyName));
foreach (var missingRequiredProperty in validationInfo.RequiredProperties)
{
var addedError = false;
var modelStateKey = ModelBindingHelper.CreatePropertyModelName(
bindingContext.ValidationNode.ModelStateKey, missingRequiredProperty);
// Update Model as SetProperty() would: Place null value where validator will check for non-null. This
// ensures a failure result from a required validator (if any) even for a non-nullable property.
// (Otherwise, propertyMetadata.Model is likely already null.)
var propertyMetadata = bindingContext.PropertyMetadata[missingRequiredProperty];
propertyMetadata.Model = null;
// Execute validator (if any) to get custom error message.
IModelValidator validator;
if (validationInfo.RequiredValidators.TryGetValue(missingRequiredProperty, out validator))
{
addedError = RunValidator(validator, bindingContext, propertyMetadata, modelStateKey);
}
// Fall back to default message if BindingBehaviorAttribute required this property or validator
// (oddly) succeeded.
if (!addedError)
{
bindingContext.ModelState.TryAddModelError(
modelStateKey,
Resources.FormatMissingRequiredMember(missingRequiredProperty));
}
}
// for each property that was bound, call the setter, recording exceptions as necessary
foreach (var entry in dto.Results)
{
var propertyMetadata = entry.Key;
var dtoResult = entry.Value;
if (dtoResult != null)
{
IModelValidator requiredValidator;
validationInfo.RequiredValidators.TryGetValue(propertyMetadata.PropertyName,
out requiredValidator);
SetProperty(bindingContext, propertyMetadata, dtoResult, requiredValidator);
bindingContext.ValidationNode.ChildNodes.Add(dtoResult.ValidationNode);
}
}
}
public async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext,
typeof(KeyValuePair <TKey, TValue>),
allowNullModel: true);
var keyResult = await TryBindStrongModel <TKey>(bindingContext, "Key");
var valueResult = await TryBindStrongModel <TValue>(bindingContext, "Value");
if (keyResult.IsModelSet && valueResult.IsModelSet)
{
var model = new KeyValuePair <TKey, TValue>(
ModelBindingHelper.CastOrDefault <TKey>(keyResult.Model),
ModelBindingHelper.CastOrDefault <TValue>(valueResult.Model));
return(ModelBindingResult.Success(bindingContext.ModelName, model));
}
else if (!keyResult.IsModelSet && valueResult.IsModelSet)
{
bindingContext.ModelState.TryAddModelError(
keyResult.Key,
bindingContext.ModelMetadata.ModelBindingMessageProvider.MissingKeyOrValueAccessor());
// Were able to get some data for this model.
// Always tell the model binding system to skip other model binders.
return(ModelBindingResult.Failed(bindingContext.ModelName));
}
else if (keyResult.IsModelSet && !valueResult.IsModelSet)
{
bindingContext.ModelState.TryAddModelError(
valueResult.Key,
bindingContext.ModelMetadata.ModelBindingMessageProvider.MissingKeyOrValueAccessor());
// Were able to get some data for this model.
// Always tell the model binding system to skip other model binders.
return(ModelBindingResult.Failed(bindingContext.ModelName));
}
else
{
// If we failed to find data for a top-level model, then generate a
// default 'empty' model and return it.
if (bindingContext.IsTopLevelObject)
{
var model = new KeyValuePair <TKey, TValue>();
return(ModelBindingResult.Success(bindingContext.ModelName, model));
}
return(ModelBindingResult.NoResult);
}
}
// Used when the ValueProvider contains the collection to be bound as a single element, e.g. the raw value
// is [ "1", "2" ] and needs to be converted to an int[].
// Internal for testing.
internal async Task <CollectionResult> BindSimpleCollection(
ModelBindingContext bindingContext,
object rawValue,
CultureInfo culture)
{
var boundCollection = new List <TElement>();
var metadataProvider = bindingContext.OperationBindingContext.MetadataProvider;
var elementMetadata = metadataProvider.GetMetadataForType(typeof(TElement));
var validationNode = new ModelValidationNode(
bindingContext.ModelName,
bindingContext.ModelMetadata,
boundCollection);
var rawValueArray = RawValueToObjectArray(rawValue);
foreach (var rawValueElement in rawValueArray)
{
var innerBindingContext = ModelBindingContext.GetChildModelBindingContext(
bindingContext,
bindingContext.ModelName,
elementMetadata);
innerBindingContext.ValueProvider = new CompositeValueProvider
{
// our temporary provider goes at the front of the list
new ElementalValueProvider(bindingContext.ModelName, rawValueElement, culture),
bindingContext.ValueProvider
};
object boundValue = null;
var result =
await bindingContext.OperationBindingContext.ModelBinder.BindModelAsync(innerBindingContext);
if (result != null && result.IsModelSet)
{
boundValue = result.Model;
if (result.ValidationNode != null)
{
validationNode.ChildNodes.Add(result.ValidationNode);
}
}
boundCollection.Add(ModelBindingHelper.CastOrDefault <TElement>(boundValue));
}
return(new CollectionResult
{
ValidationNode = validationNode,
Model = boundCollection
});
}
/// <summary>
/// Attempts to convert the values in <paramref name="result"/> to the specified type.
/// </summary>
/// <param name="result">The <see cref="ValueProviderResult"/>.</param>
/// <param name="type">The <see cref="Type"/> for conversion.</param>
/// <returns>
/// The converted value, or the default value of <paramref name="type"/> if the value could not be converted.
/// </returns>
public static object ConvertTo(this ValueProviderResult result, [NotNull] Type type)
{
object valueToConvert = null;
if (result.Values.Count == 1)
{
valueToConvert = result.Values[0];
}
else if (result.Values.Count > 1)
{
valueToConvert = result.Values.ToArray();
}
return(ModelBindingHelper.ConvertTo(valueToConvert, type, result.Culture));
}
/// <summary>
/// Attempts to convert the values in <paramref name="result"/> to the specified type.
/// </summary>
/// <typeparam name="T">The <see cref="Type"/> for conversion.</typeparam>
/// <param name="result">The <see cref="ValueProviderResult"/>.</param>
/// <returns>
/// The converted value, or the default value of <typeparamref name="T"/> if the value could not be converted.
/// </returns>
public static T ConvertTo <T>(this ValueProviderResult result)
{
object valueToConvert = null;
if (result.Values.Count == 1)
{
valueToConvert = result.Values[0];
}
else if (result.Values.Count > 1)
{
valueToConvert = result.Values.ToArray();
}
return(ModelBindingHelper.ConvertTo <T>(valueToConvert, result.Culture));
}
/// <inheritdoc />
protected override Task <ModelBindingResult> BindModelCoreAsync([NotNull] ModelBindingContext bindingContext)
{
var request = bindingContext.OperationBindingContext.HttpContext.Request;
var modelMetadata = bindingContext.ModelMetadata;
// Property name can be null if the model metadata represents a type (rather than a property or parameter).
var headerName = bindingContext.BinderModelName ?? modelMetadata.PropertyName ?? bindingContext.ModelName;
object model = null;
if (bindingContext.ModelType == typeof(string))
{
var value = request.Headers.Get(headerName);
if (value != null)
{
model = value;
}
}
else if (typeof(IEnumerable <string>).IsAssignableFrom(bindingContext.ModelType))
{
var values = request.Headers.GetCommaSeparatedValues(headerName);
if (values != null)
{
model = ModelBindingHelper.ConvertValuesToCollectionType(
bindingContext.ModelType,
values);
}
}
ModelValidationNode validationNode = null;
if (model != null)
{
validationNode = new ModelValidationNode(
bindingContext.ModelName,
bindingContext.ModelMetadata,
model);
var attemptedValue = (model as string) ?? request.Headers.Get(headerName);
var valueProviderResult = new ValueProviderResult(model, attemptedValue, CultureInfo.InvariantCulture);
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
}
return(Task.FromResult(
new ModelBindingResult(
model,
bindingContext.ModelName,
isModelSet: model != null,
validationNode: validationNode)));
}
public async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
var valueProviderResult = await GetCompatibleValueProviderResult(bindingContext);
if (valueProviderResult == null)
{
// conversion would have failed
return(null);
}
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
var model = valueProviderResult.RawValue;
ModelBindingHelper.ReplaceEmptyStringWithNull(bindingContext.ModelMetadata, ref model);
return(new ModelBindingResult(model, bindingContext.ModelName, isModelSet: true));
}
public async Task <bool> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext,
typeof(KeyValuePair <TKey, TValue>),
allowNullModel: true);
var keyResult = await TryBindStrongModel <TKey>(bindingContext, "key");
var valueResult = await TryBindStrongModel <TValue>(bindingContext, "value");
if (keyResult.Success && valueResult.Success)
{
bindingContext.Model = new KeyValuePair <TKey, TValue>(keyResult.Model, valueResult.Model);
}
return(keyResult.Success || valueResult.Success);
}
public async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext,
typeof(KeyValuePair <TKey, TValue>),
allowNullModel: true);
var keyResult = await TryBindStrongModel <TKey>(bindingContext, "Key");
var valueResult = await TryBindStrongModel <TValue>(bindingContext, "Value");
if (keyResult.IsModelSet && valueResult.IsModelSet)
{
var model = new KeyValuePair <TKey, TValue>(
ModelBindingHelper.CastOrDefault <TKey>(keyResult.Model),
ModelBindingHelper.CastOrDefault <TValue>(valueResult.Model));
// Success
return(new ModelBindingResult(model, bindingContext.ModelName, isModelSet: true));
}
else if (!keyResult.IsModelSet && valueResult.IsModelSet)
{
bindingContext.ModelState.TryAddModelError(
keyResult.Key,
Resources.KeyValuePair_BothKeyAndValueMustBePresent);
// Were able to get some data for this model.
// Always tell the model binding system to skip other model binders i.e. return non-null.
return(new ModelBindingResult(model: null, key: bindingContext.ModelName, isModelSet: false));
}
else if (keyResult.IsModelSet && !valueResult.IsModelSet)
{
bindingContext.ModelState.TryAddModelError(
valueResult.Key,
Resources.KeyValuePair_BothKeyAndValueMustBePresent);
// Were able to get some data for this model.
// Always tell the model binding system to skip other model binders i.e. return non-null.
return(new ModelBindingResult(model: null, key: bindingContext.ModelName, isModelSet: false));
}
else
{
// Caller (GenericModelBinder) was able to resolve a binder type and will create a ModelBindingResult
// that exits current ModelBinding loop.
return(null);
}
}
internal static async Task <ValueProviderResult> GetCompatibleValueProviderResult(ModelBindingContext context)
{
ModelBindingHelper.ValidateBindingContext(context);
var valueProviderResult = await context.ValueProvider.GetValueAsync(context.ModelName);
if (valueProviderResult == null)
{
return(null); // the value doesn't exist
}
if (!context.ModelType.IsCompatibleWith(valueProviderResult.RawValue))
{
return(null); // value is of incompatible type
}
return(valueProviderResult);
}
public async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (bindingContext.ModelMetadata.IsComplexType)
{
// this type cannot be converted
return(null);
}
var valueProviderResult = await bindingContext.ValueProvider.GetValueAsync(bindingContext.ModelName);
if (valueProviderResult == null)
{
return(null); // no entry
}
object newModel;
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
try
{
newModel = valueProviderResult.ConvertTo(bindingContext.ModelType);
ModelBindingHelper.ReplaceEmptyStringWithNull(bindingContext.ModelMetadata, ref newModel);
var validationNode = new ModelValidationNode(
bindingContext.ModelName,
bindingContext.ModelMetadata,
newModel);
return(new ModelBindingResult(
newModel,
bindingContext.ModelName,
isModelSet: true,
validationNode: validationNode));
}
catch (Exception ex)
{
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, ex);
}
// Were able to find a converter for the type but conversion failed.
// Tell the model binding system to skip other model binders i.e. return non-null.
return(new ModelBindingResult(model: null, key: bindingContext.ModelName, isModelSet: false));
}
/// <summary>
/// Attempts to convert the values in <paramref name="result"/> to the specified type.
/// </summary>
/// <param name="result">The <see cref="ValueProviderResult"/>.</param>
/// <param name="type">The <see cref="Type"/> for conversion.</param>
/// <returns>
/// The converted value, or the default value of <paramref name="type"/> if the value could not be converted.
/// </returns>
public static object ConvertTo(this ValueProviderResult result, Type type)
{
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
object valueToConvert = null;
if (result.Values.Count == 1)
{
valueToConvert = result.Values[0];
}
else if (result.Values.Count > 1)
{
valueToConvert = result.Values.ToArray();
}
return(ModelBindingHelper.ConvertTo(valueToConvert, type, result.Culture));
}
public virtual async Task <bool> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (!await bindingContext.ValueProvider.ContainsPrefixAsync(bindingContext.ModelName))
{
return(false);
}
var valueProviderResult = await bindingContext.ValueProvider.GetValueAsync(bindingContext.ModelName);
var bindCollectionTask = valueProviderResult != null?
BindSimpleCollection(bindingContext, valueProviderResult.RawValue, valueProviderResult.Culture) :
BindComplexCollection(bindingContext);
var boundCollection = await bindCollectionTask;
return(CreateOrReplaceCollection(bindingContext, boundCollection));
}
// Validates a single node (not including children)
// Returns true if validation passes successfully
private static bool ShallowValidate(
ModelMetadata metadata,
ValidationContext validationContext,
[NotNull] IEnumerable <IModelValidator> validators)
{
var isValid = true;
string modelKey = null;
// When the are no validators we bail quickly. This saves a GetEnumerator allocation.
// In a large array (tens of thousands or more) scenario it's very significant.
var validatorsAsCollection = validators as ICollection;
if (validatorsAsCollection != null && validatorsAsCollection.Count == 0)
{
return(isValid);
}
var modelValidationContext =
new ModelValidationContext(validationContext.ModelValidationContext, metadata);
foreach (var validator in validators)
{
foreach (var error in validator.Validate(modelValidationContext))
{
if (modelKey == null)
{
modelKey = validationContext.RootPrefix;
// This constructs the object heirarchy
// Example: prefix.Parent.Child
foreach (var keyBuilder in validationContext.KeyBuilders.Reverse())
{
modelKey = keyBuilder.AppendTo(modelKey);
}
}
var errorKey = ModelBindingHelper.CreatePropertyModelName(modelKey, error.MemberName);
validationContext.ModelValidationContext.ModelState.AddModelError(errorKey, error.Message);
isValid = false;
}
}
return(isValid);
}
public async Task <bool> BindModelAsync(ModelBindingContext bindingContext)
{
var valueProviderResult = await GetCompatibleValueProviderResult(bindingContext);
if (valueProviderResult == null)
{
// conversion would have failed
return(false);
}
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
var model = valueProviderResult.RawValue;
ModelBindingHelper.ReplaceEmptyStringWithNull(bindingContext.ModelMetadata, ref model);
bindingContext.Model = model;
// TODO: Determine if we need IBodyValidator here.
return(true);
}
/// <inheritdoc />
public async Task <ModelBindingResult> BindModelAsync([NotNull] ModelBindingContext bindingContext)
{
object value;
if (bindingContext.ModelType == typeof(IFormFile))
{
var postedFiles = await GetFormFilesAsync(bindingContext);
value = postedFiles.FirstOrDefault();
}
else if (typeof(IEnumerable <IFormFile>).IsAssignableFrom(bindingContext.ModelType))
{
var postedFiles = await GetFormFilesAsync(bindingContext);
value = ModelBindingHelper.ConvertValuesToCollectionType(bindingContext.ModelType, postedFiles);
}
else
{
// This binder does not support the requested type.
return(null);
}
ModelValidationNode validationNode = null;
if (value != null)
{
validationNode =
new ModelValidationNode(bindingContext.ModelName, bindingContext.ModelMetadata, value)
{
SuppressValidation = true,
};
var valueProviderResult = new ValueProviderResult(rawValue: value);
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
}
return(new ModelBindingResult(
value,
bindingContext.ModelName,
isModelSet: value != null,
validationNode: validationNode));
}
internal async Task <BindResult <TModel> > TryBindStrongModel <TModel>(ModelBindingContext parentBindingContext,
string propertyName)
{
var propertyBindingContext = new ModelBindingContext(parentBindingContext)
{
ModelMetadata = parentBindingContext.MetadataProvider.GetMetadataForType(modelAccessor: null,
modelType: typeof(TModel)),
ModelName = ModelBindingHelper.CreatePropertyModelName(parentBindingContext.ModelName, propertyName)
};
if (await propertyBindingContext.ModelBinder.BindModelAsync(propertyBindingContext))
{
var untypedModel = propertyBindingContext.Model;
var model = ModelBindingHelper.CastOrDefault <TModel>(untypedModel);
parentBindingContext.ValidationNode.ChildNodes.Add(propertyBindingContext.ValidationNode);
return(new BindResult <TModel>(success: true, model: model));
}
return(new BindResult <TModel>(success: false, model: default(TModel)));
}
public virtual async Task <bool> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (!CanBindType(bindingContext.ModelType) ||
!await bindingContext.ValueProvider.ContainsPrefixAsync(bindingContext.ModelName))
{
return(false);
}
EnsureModel(bindingContext);
var propertyMetadatas = GetMetadataForProperties(bindingContext);
var dto = CreateAndPopulateDto(bindingContext, propertyMetadatas);
// post-processing, e.g. property setters and hooking up validation
ProcessDto(bindingContext, dto);
// complex models require full validation
bindingContext.ValidationNode.ValidateAllProperties = true;
return(true);
}
/// <inheritdoc />
public async Task <ModelBindingResult> BindModelAsync([NotNull] ModelBindingContext bindingContext)
{
if (bindingContext.ModelType == typeof(IFormFile))
{
var postedFiles = await GetFormFilesAsync(bindingContext);
var value = postedFiles.FirstOrDefault();
return(new ModelBindingResult(value, bindingContext.ModelName, isModelSet: value != null));
}
else if (typeof(IEnumerable <IFormFile>).GetTypeInfo().IsAssignableFrom(
bindingContext.ModelType.GetTypeInfo()))
{
var postedFiles = await GetFormFilesAsync(bindingContext);
var value = ModelBindingHelper.ConvertValuesToCollectionType(bindingContext.ModelType, postedFiles);
return(new ModelBindingResult(value, bindingContext.ModelName, isModelSet: value != null));
}
return(null);
}
public virtual async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (!await bindingContext.ValueProvider.ContainsPrefixAsync(bindingContext.ModelName))
{
return(null);
}
var valueProviderResult = await bindingContext.ValueProvider.GetValueAsync(bindingContext.ModelName);
var bindCollectionTask = valueProviderResult != null?
BindSimpleCollection(bindingContext, valueProviderResult.RawValue, valueProviderResult.Culture) :
BindComplexCollection(bindingContext);
var boundCollection = await bindCollectionTask;
var model = GetModel(boundCollection);
return(new ModelBindingResult(model, bindingContext.ModelName, isModelSet: true));
}
// Used when the ValueProvider contains the collection to be bound as a single element, e.g. the raw value
// is [ "1", "2" ] and needs to be converted to an int[].
// Internal for testing.
internal async Task <CollectionResult> BindSimpleCollection(
ModelBindingContext bindingContext,
ValueProviderResult values)
{
var boundCollection = new List <TElement>();
var metadataProvider = bindingContext.OperationBindingContext.MetadataProvider;
var elementMetadata = metadataProvider.GetMetadataForType(typeof(TElement));
var innerBindingContext = ModelBindingContext.CreateChildBindingContext(
bindingContext,
elementMetadata,
fieldName: bindingContext.FieldName,
modelName: bindingContext.ModelName,
model: null);
foreach (var value in values)
{
innerBindingContext.ValueProvider = new CompositeValueProvider
{
// our temporary provider goes at the front of the list
new ElementalValueProvider(bindingContext.ModelName, value, values.Culture),
bindingContext.ValueProvider
};
object boundValue = null;
var result =
await bindingContext.OperationBindingContext.ModelBinder.BindModelAsync(innerBindingContext);
if (result != null && result.IsModelSet)
{
boundValue = result.Model;
boundCollection.Add(ModelBindingHelper.CastOrDefault <TElement>(boundValue));
}
}
return(new CollectionResult
{
Model = boundCollection
});
}
// Used when the ValueProvider contains the collection to be bound as a single element, e.g. the raw value
// is [ "1", "2" ] and needs to be converted to an int[].
internal async Task <IEnumerable <TElement> > BindSimpleCollection(ModelBindingContext bindingContext,
object rawValue,
CultureInfo culture)
{
if (rawValue == null)
{
return(null); // nothing to do
}
var boundCollection = new List <TElement>();
var metadataProvider = bindingContext.OperationBindingContext.MetadataProvider;
var elementMetadata = metadataProvider.GetMetadataForType(typeof(TElement));
var rawValueArray = RawValueToObjectArray(rawValue);
foreach (var rawValueElement in rawValueArray)
{
var innerBindingContext = ModelBindingContext.GetChildModelBindingContext(
bindingContext,
bindingContext.ModelName,
elementMetadata);
innerBindingContext.ValueProvider = new CompositeValueProvider
{
// our temporary provider goes at the front of the list
new ElementalValueProvider(bindingContext.ModelName, rawValueElement, culture),
bindingContext.ValueProvider
};
object boundValue = null;
var result = await bindingContext.OperationBindingContext.ModelBinder.BindModelAsync(innerBindingContext);
if (result != null)
{
boundValue = result.Model;
}
boundCollection.Add(ModelBindingHelper.CastOrDefault <TElement>(boundValue));
}
return(boundCollection);
}
private async Task <ModelBindingResult> BindModelCoreAsync(ModelBindingContext bindingContext)
{
object value;
if (bindingContext.ModelType == typeof(IFormFile))
{
var postedFiles = await GetFormFilesAsync(bindingContext);
value = postedFiles.FirstOrDefault();
}
else if (typeof(IEnumerable <IFormFile>).IsAssignableFrom(bindingContext.ModelType))
{
var postedFiles = await GetFormFilesAsync(bindingContext);
value = ModelBindingHelper.ConvertValuesToCollectionType(bindingContext.ModelType, postedFiles);
}
else
{
// This binder does not support the requested type.
Debug.Fail("We shouldn't be called without a matching type.");
return(ModelBindingResult.NoResult);
}
if (value == null)
{
return(ModelBindingResult.Failed(bindingContext.ModelName));
}
else
{
bindingContext.ValidationState.Add(value, new ValidationStateEntry()
{
SuppressValidation = true
});
bindingContext.ModelState.SetModelValue(
bindingContext.ModelName,
rawValue: null,
attemptedValue: null);
return(ModelBindingResult.Success(bindingContext.ModelName, value));
}
}
public async Task <bool> BindModelAsync(ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (!ValueProviderResult.CanConvertFromString(bindingContext.ModelType))
{
// this type cannot be converted
return(false);
}
var valueProviderResult = await bindingContext.ValueProvider.GetValueAsync(bindingContext.ModelName);
if (valueProviderResult == null)
{
return(false); // no entry
}
object newModel;
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
try
{
newModel = valueProviderResult.ConvertTo(bindingContext.ModelType);
ModelBindingHelper.ReplaceEmptyStringWithNull(bindingContext.ModelMetadata, ref newModel);
bindingContext.Model = newModel;
}
catch (Exception ex)
{
if (IsFormatException(ex))
{
// there was a type conversion failure
bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex.Message);
}
else
{
bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex);
}
}
return(true);
}
public async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
var valueProviderResult = await GetCompatibleValueProviderResult(bindingContext);
if (valueProviderResult == null)
{
// conversion would have failed
return(null);
}
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
var model = valueProviderResult.RawValue;
ModelBindingHelper.ReplaceEmptyStringWithNull(bindingContext.ModelMetadata, ref model);
// We do not need to set an explict ModelValidationNode since CompositeModelBinder does that automatically.
return(new ModelBindingResult(
model,
bindingContext.ModelName,
isModelSet: true));
}
/// <inheritdoc />
public Task <ModelBindingResult> BindModelAsync([NotNull] ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (!CanBindType(bindingContext.ModelMetadata))
{
return(ModelBindingResult.NoResultAsync);
}
var mutableObjectBinderContext = new MutableObjectBinderContext()
{
ModelBindingContext = bindingContext,
PropertyMetadata = GetMetadataForProperties(bindingContext).ToArray(),
};
if (!(CanCreateModel(mutableObjectBinderContext)))
{
return(ModelBindingResult.NoResultAsync);
}
return(BindModelCoreAsync(bindingContext, mutableObjectBinderContext));
}
public async Task <ModelBindingResult> BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext.ModelType != typeof(ComplexModelDto))
{
return(null);
}
ModelBindingHelper.ValidateBindingContext(bindingContext, typeof(ComplexModelDto), allowNullModel: false);
var dto = (ComplexModelDto)bindingContext.Model;
foreach (var propertyMetadata in dto.PropertyMetadata)
{
var propertyModelName = ModelNames.CreatePropertyModelName(
bindingContext.ModelName,
propertyMetadata.BinderModelName ?? propertyMetadata.PropertyName);
var propertyBindingContext = ModelBindingContext.GetChildModelBindingContext(
bindingContext,
propertyModelName,
propertyMetadata);
var modelBindingResult =
await bindingContext.OperationBindingContext.ModelBinder.BindModelAsync(propertyBindingContext);
if (modelBindingResult == null)
{
// Could not bind. Add a result so MutableObjectModelBinder will check for [DefaultValue].
dto.Results[propertyMetadata] =
new ModelBindingResult(model: null, key: propertyModelName, isModelSet: false);
}
else
{
dto.Results[propertyMetadata] = modelBindingResult;
}
}
return(new ModelBindingResult(dto, bindingContext.ModelName, isModelSet: true));
}
/// <inheritdoc />
public virtual async Task <ModelBindingResult> BindModelAsync([NotNull] ModelBindingContext bindingContext)
{
ModelBindingHelper.ValidateBindingContext(bindingContext);
if (!CanBindType(bindingContext.ModelMetadata))
{
return(null);
}
var mutableObjectBinderContext = new MutableObjectBinderContext()
{
ModelBindingContext = bindingContext,
PropertyMetadata = GetMetadataForProperties(bindingContext).ToArray(),
};
if (!(await CanCreateModel(mutableObjectBinderContext)))
{
return(null);
}
// Create model first (if necessary) to avoid reporting errors about properties when activation fails.
var model = GetModel(bindingContext);
var results = await BindPropertiesAsync(bindingContext, mutableObjectBinderContext.PropertyMetadata);
var validationNode = new ModelValidationNode(
bindingContext.ModelName,
bindingContext.ModelMetadata,
model);
// Post-processing e.g. property setters and hooking up validation.
bindingContext.Model = model;
ProcessResults(bindingContext, results, validationNode);
return(new ModelBindingResult(
model,
bindingContext.ModelName,
isModelSet: true,
validationNode: validationNode));
}